Remove OpenSSL support; only support PyCryptodome

This allows us to clean up the code a lot.

On Windows, it isn't installed by default and
most of the time not be found at all.

On M1 Macs, the kernel will kill the process instead.

Closes #33.

DeDRM_plugin/ignoblekeyWindowsStore.py

@@ -15,8 +15,10 @@ import apsw
 import base64
 try: 
     from Cryptodome.Cipher import AES
+    from Cryptodome.Util.Padding import unpad
 except:
     from Crypto.Cipher import AES
+    from Crypto.Util.Padding import unpad
 import hashlib
 from lxml import etree
 
@@ -24,15 +26,6 @@ from lxml import etree
 NOOK_DATA_FOLDER = "%LOCALAPPDATA%\\Packages\\BarnesNoble.Nook_ahnzqzva31enc\\LocalState"
 PASS_HASH_SECRET = "9ca588496a1bc4394553d9e018d70b9e"
 
-def unpad(data):
-
-    if sys.version_info[0] == 2:
-        pad_len = ord(data[-1])
-    else:
-        pad_len = data[-1]
-
-    return data[:-pad_len]
-
 
 def dump_keys(print_result=False):
     db_filename = os.path.expandvars(NOOK_DATA_FOLDER + "\\NookDB.db3")
@@ -64,7 +57,7 @@ def dump_keys(print_result=False):
 
     for pass_hash in activation_xml.findall(".//{http://ns.adobe.com/adept}passHash"):
         encrypted_cc_hash = base64.b64decode(pass_hash.text)
-        cc_hash = unpad(AES.new(hash_key, AES.MODE_CBC, encrypted_cc_hash[:16]).decrypt(encrypted_cc_hash[16:]))
+        cc_hash = unpad(AES.new(hash_key, AES.MODE_CBC, encrypted_cc_hash[:16]).decrypt(encrypted_cc_hash[16:]), 16)
         decrypted_hashes.append((base64.b64encode(cc_hash).decode("ascii")))
         if print_result:
             print("Nook ccHash is %s" % (base64.b64encode(cc_hash).decode("ascii")))